Audio amplification valve



Jan. 7, 1930. E. F. MILLER 1,742,662

AUDIO 'AMPLIFICATI-ON VALVE Filed Aug. 6. 1928 BY hlS HT TOR/VEX Patented Jan. 7, 1930 um'rsn srarss rArENr oFFi I EDWARD FRANCIS MILLER, OF MANLY, SYDNEY, NEW SOUTH WALES, AUSTRALIA.

AUDIO AMPLIFICATION VALVE .App1ication filed August e, 1928. s rial 110'. 297,889.

The invention is principally for employment in connection with a alve of ordinary type used 1n recelving from a wireless aerial or in connection with a microphone, the ob 5 jectbeing to amplify the effect induced in such a valve by impulses from an aerial or from a microphone or from a similar existing medium.

Impulses from the medium affecting said valve of ordinary type are more readily am a filament, two soft iron grids each encased in insulating material, two plates coupled byv a common magnet. The filament is located between the grids, and the plates are arranged one.outside of each grid and parallel thereto, the..poles of the electromagnet are connected b a magnetic conductor one toeach of the grids.

Electronic emission from the filament tending to affect the plates is controlled by the magnetic field set up between the grids, the magnetic field being produced and controlled by the electromagnet which is excited by current from a secondary battery.

The winding of the electro magnet is electrically connected at one end to the two plates and at the other end to the plate of the valve of ordinary type referred to, or when in a series, to both plates of the preceding valve according to this invention.

One of the filament leads is common to the ne ative poles of a primaryand of the seconfiary battery.

My invention is illustrated in the accompanying drawing wherein Fig.1 is a front elevation and Fig. 2, a plan,

ad, and a horseshoe electro- Fig. 3 is a diagrammatic illustration of the employment of a series of-valves.

- Referring first to Figs. 1 and 2:

" electrode type having the filament 19. grid The evacuated glass bulb 1. contains the filament 2. which is electrically connected to the adapter pin 3. and 4. p

The soft iron grids 5. and 6. preferably encased in glass or other insulating material are severally connected by the magnetic conductors 6 and 7. to the respective poles 8. and 9. of a horseshoe electromagnet 10. which is excited by current in the winding 11. one end of which is connected to terminal 12. while the opposite end is connected to the two plates13. and 14. disposed one uponiheach side Qfithe, grids and parallel therewith. in

The electromagnet is supported by the, l arms-15. -Alead16. connects the plates to a terminal 17.

Referring. now to Fig. 3: The parts corresponding to those referred to in. the description of Figs. 1 and 2 are indicated'by the same reference numerals.

The diagram illustrates the disposition and connection of a series of valves.

- The first valve 18. is of the ordinary three 20 and plate 21.

The conductor 22. from the negative pole of a primary battery is also connected by lead, 23. to the negative pole of the secondary battery.

The return conductor 24. is connected to the filament 19. of valve 18., and also to the filament 2. ,of each of the other valves in the series.

Under working conditions current from the secondary battery passes from filament 19. to plate 21. which is connected through the windings of the series of electromagnets 10. to the positive pole of the secondary battery- The electromagnets are thereby excited and as opposing poles thereof are connected to the. respective grids a magnetic field is produced which magnetizes individually each electron given oflf from the filament which are attracted towards the grid. I

The electrons near the grid are more in- 95 flueneed by the plate than by the grid and are attracted by the positive pull of the plate thereby causing a flow of current from the secondary battery to the plate.

induced by the next valve passes to the electromagnet of the next succeeding valve wherein are amplification is repeated and so on throughout the series whereby the current finally available for use is the sum of the current induced by all the valves.

A variation of potential in the grid 20. of valve 18. causes a variation in the amount of current from the secondary battery passing from the filament to the plates in each of the succeeding valves in the series.

I claim:

1. An audio amplification valve wherein are combined a filament, two grids and two plates parallel with the grids, a horse-shoe electromagnet, magnetic connection between the poles of the magnet and each of said grids, the magnet being surrounded by a winding one end of which is connected to the plates and the other to a terminal on the'valve.

2. In an audio amplification valve a fila-- ment, a horseshoe electromagnet, two soft iron grids, magnetic connecting means between the poles of the magnet and the grids, the winding of the magnet connected at one end to a terminal on the valve and the opposite end designed for electrical connection to the plate of another valve.

In testimony whereof I have signed my name to this specification.

E. F. MILLER. 

